A starter relay for heavy-duty vehicles

Abstract

The invention relates to a starter relay for heavy vehicles. It includes a housing, an armature, a reed, an L-shaped yoke, a coil in the housing, an iron core, a moving contact and a static contact; the improvement lies in: on the housing outside the same side of the moving contact and the static contact A strip-shaped electrical iron is provided, and magnetic steel slots are respectively arranged on the shells on both sides of the electrical iron, and permanent magnets are arranged in the corresponding magnetic steel slots on both sides, and the bottom of the permanent magnet is located on the top surface of the electrical iron. The magnetic force of the permanent magnet is used to elongate the arc and reduce the temperature generated by the arc, so that the arc is self-extinguished to achieve the purpose of arc suppression and solve the problem of ablation of the contacts of the heavy-duty vehicle starter relay caused by the arc. The reliability of the starting relay is greatly improved, and the potential safety hazard of the starter fire caused by the contact ablation of the starting relay is eliminated.

Description

technical field [0001] The invention belongs to the technical field of automobile electrical appliances, and in particular relates to a starter relay for heavy-duty automobiles. Background technique [0002] The starter relay of the car is used to turn on and off the electromagnetic switch circuit on the starter. The main body of the starter electromagnetic switch is an inductance coil, which will generate 5 to 10 times the impact current when it is powered on, and a reverse electromotive force of up to hundreds of volts will be generated when the power is turned off. Both the impact current and the reverse electromotive force will generate an arc. The strong arc Weakness is determined by the size of the current and the level of the back electromotive force. Nowadays, heavy-duty vehicles such as heavy-duty trucks and buses have starters with relatively high power and large current, and the voltage is also 24V. When the power is turned off, a reverse electromotive force of u...

AI Technical Summary

Problems solved by technology

Nowadays, heavy-duty vehicles such as heavy-duty trucks and buses have starters with relatively high power and large current, and the voltage is also 24V. When the power is turned off, a reverse electromotive force of up to hundreds of volts will be generated, resulting in a spark temperature of several thousand degrees generated by the arc. , easy to cause ablation of the contacts of the starter relay

Once the contacts of the starter relay are ablated, the starter electromagnetic switch cannot be powered off in time, and the starter burns down after being energized for a long time. Therefore, the starter relay directly affects the circuit safety of the heavy-duty vehicle starter circuit

In order to solve the problem of easy ablation of the contacts of the heavy-duty vehicle starter relay, AgSnO2 with good heat resistance and electrical conductivity is usually used as the contact material, or even pure silver and pure gold are used, which not only have high cost but also general effect.

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